1553BRT-EBR Datasheet, PDF (6/28 Pages) Actel Corporation – Core1553BRT-EBR Enhanced Bit Rate 1553 Remote Terminal

Core1553BRT-EBR Enhanced Bit Rate 1553 Remote Terminal
Word Formats
There are only three types of words in a 1553EBR message: a command word (CW), a data word (DW), and a status
word (SW). Each word consists of a 3-bit sync pattern, 16 bits of data, and a parity bit, providing the 20-bit word (see
Figure 4).
Bit 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
CW
Sync
5
RT Address
1
5
T/R
Sub-Address
5
1
Word Count / Mode Code P
DW
Sync
16
1
Data
P
SW
Sync
5
RT Address
111
3
Reserved
111111
Figure 4 • 1553EBR Word Formats
I/O Signal Descriptions
Table 2 • 1553EBR Bus Interface
Port Name
Type
RTADDR[4:0]
In
RTADDRP
In
RTADERR
Out
BUSAINENn
Out
BUSAIN
In
BUSBINENn
Out
BUSBIN
In
BUSAOUTEN
Out
BUSAOUT
Out
BUSBOUTEN
Out
BUSBOUT
Out
Description
Sets the RT address; must not be set at '11111'
RT Address parity input. This input should be set high or low to achieve odd parity on the
RTADDR and RTADDRP inputs. If RTADDR is set to '00000', the RTADDRP input should be set
to '1'.
Indicates that the RTADDR and RTADDRP inputs have incorrect parity, or broadcast is enabled
and the RT address is set to 31; when active (high), the RT is disabled and will ignore all
1553EBR traffic.
Active low enable for the A receiver
Data input from the A receiver
Active low enable for the B receiver
Data input from the B receiver
Active high transmitter enable for the A transmitter
Data output to the Bus A transmitter
Active high transmitter enable for the B transmitter
Data output to the Bus B transmitter
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